328 MOBPHOLOGY AND EVOLUTION
Gascony; and he asserted that they were the remains of a Gibbon, He sent the fossil to Paris where it was examined by de Blainville, who described it as follows (20) : " The principal figure consists in the lower jaw, almost complete, having all the teeth present, and wanting only the terminating portion of the ascending branches. This jaw measures in length an inch and a half from the incisive teeth to the anterior root of the ascending branches, and the same in width between these two points; the angle of union of the body and branches is 25 degrees, and the length of the symphysis is 9 lines: the profile view of the symphysis is rather oblique, since it forms with the base of the jaw an angle of 50 degrees. Of the two surfaces of the body of the mandible the external has a single foramen menti, small and opening immediately below the first anterior molar ; the internal shows merely a cavity for the insertion of the genio-hyoideus muscle, without any distinct genioid process. The base is thick, rounded and perfectly smooth; the alveolar margin occupied by a series of contiguous teeth, that is without any interval between them, pretty nearly of the same height, and forming a parabola or horseshoe figure." Many subsequent observers, from the examination of the original specimen or of the many others discovered in the Miocene and Pliocene rocks of France, Germany and Switzerland, came to the conclusion that the animal is closely allied to, or should be included in the genus Hykbates. Gervais named it Pliopithecus antiquus.
Schlosser and others regard Pliopithecus both as a descendant of Propliopithecus and an ancestor of the modern £Hbbons. The incisor teeth are more vertical